Generaly every 600 miles (1000 km) with the damper blades and the 3 prop shaft neeples.
except : for long journey (1700 km) of several days when not at home,or fewer due to bad roads or rain if at home.
At the moment 23 kmiles with Devol bushes, acceptable, no shimmy at 90 km/h and 130 km/h which are generaly the critical speed for vibrations.
I have a 4 pods car lift and an air grease gun. More easy.
